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PATENTED Nf- J3 DEC 101867 @uiten gieten` @anni @ffice JOHNA GLASS, GEORGE P. SCHNEIDER, AND WILLIAM R. REZNER, 0E

CLEVELAND, OHIO. l

Letters Patent No. 71,868, dated December 10, 1867.

IMIRovRD BRIDGE.

, To ALL WHOM IT MAY ooNcERN= 1 i Be it known that we,-J. GLASS, G. P. SCHNEIDER, and W. B. REZNER, 'of Cleveland, in the county of Cuyahoga, and State of Ohio, have invented certain new and useful Improvements'n Bridges; and we do hereby i i declare the following to be a full and complete description oi the same, reference Vbeing had to the accompanying drawings, making a part of this specioation, in whichi Figure 1 is a side view of` the arch.

i Figure 2 is a longitudinal section;

i Figure 3 is an end view. Y v

i .Figure 4 is a transverse section in the direction of the line a, iig. 9.l

Figure 5 is a detached view.

Like letters of reference refer to like parts in the views. p Fig. ,1 represents Vthe arch of the bridge, which is constructed in. three sections, AB C, Itig. 4. Each ofV i the sections A B consists of a series of iron plates, bent vinto a semi-oval or circular form, while they are in the process of being manufactured or rolled out in the mill. The special curve is given to each plate, to form the -g of the arch, by a set of rollers providedfor that purpose, the degree of which being more or less, as the sprin l nature of the circumstance ma'yrequire, for the span of the bridge. These plates are then 'riveted or bolted iig. 4, forms an oval tube,

together, andwhen placed one'upouthe other, as shown' in the.' transverse section,

st axis of which being in a right line with the radii of the arch, however, may be varied from an oval more or less, as may be desired. These two sections A Bare each provided with a `flange, D, fig. 3, by which'they are riveted or bolted together, as shown Ain iig. 1. The third section, C, referred to, Vconsists of 'a diaphragm placed between the two sections A B, as seen in fig. 4, and which form the minor axisof the tube. The relative position of the diaphragm to the tubes is. shown in g. 2, in which it will be seen that it describes,l `anarch in common with the tubes, and is secured between the anges by meansof the bolts or rivets by which the two sections are fastened together. The purpose of this diaphragm is to resist the lateral strain upon the tubes, and thereby prevent any possible' vertical compression of them, thus giving additional strength to ther structure. The chord G of the arch forms the stringere on which are placed the cross-beams for supporting the iiooring of the bridge. These chords are connected tothe ends ofthe arch by rods H, the ends of said rodslbeing projected through the footblocks I, against which the ends of the arch abut, andjare secured by nuts J. These L- foot-blocks are provided with a deep ange .orboss K, iig. 5, which is made to'project into the ends of the arch, i so that the ends will rest upon the shoulders L, as shown in tig. 2. By this arrangement the blocks cannot get displaced, but afforda secure and permanent abutment forV the ends of the arch. E are the main stays, by which the stringers and ilooring of the bridge are sustained by the arch, and counterbalanced by the stays E.

The tubes of the arch as above described are curvilineal, 'but the plates may be bent so as to form an angle, making an angular tube of any variable degree of regularity, without changing the principle of a tubular arch for bridges, roofing, or other purpose to which it may be applied. v

What we claim as our improvement, and desire to secure by Letters Patent, is-

1. The tubular ilanged sections A B, as arranged in combination with the diaphragm C, for the purpose l and in the manner substantially as set forth. i 2. 4The tubular arch, as constructed with sections A B C, in combination with thc` foot-block Lprovded with a flange or boss, K, when arranged in the manner as and for the purpose set forth. i JOHN GLASS, I `GEO P. SCHNEIDER,

WM. B. REZNEB..

LW Witnesses:

l W. H. BURRIDGE, l J. HOLMES.

the longe 

